Watch live as House Democrats hold news conference on Trump and Russian Federation

In a letter to FBI acting director Andrew McCabe, Mr Chaffetz cited a report from the "New York Times" stating that Mr Comey's memo "describes a conversation in which the president referenced the FBI investigation. and said to Comey, 'I hope you can let this go.' " He asked the FBI to provide "all memoranda, notes, summaries and recordings" related to Mr Comey's communication with Mr Trump.

"Now is the time to gather all the pertinent information", Rep. Paul Ryan (R-Wisc.), the speaker of the House, told reporters Wednesday.

Last week, Senator Grassley had downplayed concerns about Comey's firing, telling those anxious to "suck it up".

Trump's approval ratings have been hovering in the high 30s and 40s.

Trump also changed his story once again about the circumstances surrounding Comey's firing, returning again to the White House's original rationale that he based his decision on Rosenstein's recommendation. "I hope you can let this go", the USA president was quoted as telling Comey in the report.

Alptekin's company paid Flynn $600,000 "to run an influence campaign aimed at discrediting Fethullah Gulen, an reclusive cleric who lives in Pennsylvania and whom Mr. Erdogan has accused of orchestrating a failed coup in Turkey last summer".

The conversation between Trump and Comey was reportedly recorded in a memo prepared by the Federal Bureau of Investigation director immediately following the meeting but was shared only with close associates and top Federal Bureau of Investigation officials. In particular, lawmakers are expected to press Comey on what exactly Trump told him in asking him to back off the Flynn investigation. "That is what Congress does in conducting oversight of the executive branch". The Flynn investigation was part of a broader probe into Russian interference in 2016's presidential election. For god's sake, they wanted him impeached even before he was the Republican nominee.

"There is no collusion between, certainly myself and my campaign, but I can only speak for myself and the Russians".

Burr and Warner also called for Comey, who hasn't appeared before the committee since his May 9 firing, to testify in closed and open sessions.

"But if you're trying to build an obstruction-of-justice case, you might want the president to keep talking, because everything he does is digging a deeper legal hole for himself".

As Republicans continue to play for time, Democrats keep hammering away at the administration. A letter from eight Democratic Senators on Wednesday demanded that the Justice Department inspector general examine whether Attorney General Jeff Sessions violated his pledge to recuse himself from the Russian Federation investigation by involving himself in the decision to fire Comey and in the search for his successor.

But the fate of its investigation hinges on Ryan's lukewarm support and the sometimes fractious working relationship between its Republican and Democratic leaders. About 10 House Republicans and four Senate Republicans have called for some sort of independent investigation.

Meanwhile, the top-ranking Democrat on the House Intelligence Committee, Adam Schiff, said that "Enough is enough", adding that "Congress needs to get to the bottom of this".

Asked if he thought he had committed a crime or impeachable offense, the president said "it's totally ridiculous, everyone thinks so".

Trump pressure rises as Russian Federation probes intensify
But Trump himself has already said that he was going to fire Comey regardless of any recommendation by the Justice Department. On Thursday, Rosenstein informed the Senate in a closed-door session about Trump's controversial decision to dump Comey.

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